Mouth guard



FIG. 1 is a front perspective view of the mouth guard;

FIG. 2 is a rear perspective view of the mouth guard;

FIG. 3 is a front elevation view of the mouth guard;

FIG. 4 is a top plan view of the mouth guard;

FIG. 5 is a rear elevation view of the mouth guard;

FIG. 6 is a side elevation view of the mouth guard; and,

FIG. 7 is a bottom plan view of the mouth guard.

The broken lines in the drawings illustrate portions of the mouth guard that form no part of the claimed design. 

CLAIM The ornamental design for a mouth guard, as shown and described. 